use the templates supplied with the kit. the guy that helped me put mine on buggered up the inner fenders by not using the template and he used a hammer rather than a saws-all to move the sheet metal out of the way of the new fenders. now I have a nice sharp jagged work area all around the inner fenders that usually finds a way to cut me or my clothes. don't let a drunk rookie help you like I did.
That's my $0.02